cusom timer

hey, i havent checked your full history, but from what i remember i haven't seen it and it should be a quick one:

background:
i needed a timer and used the DDG widget. one of the search results underneah was https://www.youtube.com/watch?v=beCu66uth0w

coding challenge:
can you make a similar looking timer for a custom time, where the rainbow is the progress bar (as in at the start you just see the first few degrees of the rainbow arc, but as time goes on more and more of the rainbow shows until it shows 180 degrees when the timer runs out?)